Combined rock-drill and reamer-bit.



E. L. DAVEUSON.

COMBINED ROCK DRiLi AND REAMER BH'x APPuc'mml HLEO FE8.26. 1915.

.l 8%. Eatented Mar. 2 1916.

so 7 attained by means of the construction illus- EUGENE L. DAVIDSON; 0FBURLINGAME, UAEEFOHNIA,

commune noon-permit AND nannies-err.

misses.

1 Application flle d Ifehruary 26, 1915. Serial Ho. 20,779.

To all whom it may concern:

' Be it known that I, EUGENE L. DAVIDSON, acitizen of the United States,residing at Burlingame, in the county of San Mateo and State ofCalifornia, have'invented certain newand useful lmprovements'in Comibined Rock-Drills and Reamer-Bits; and I do hereby declare the followingto be a full,

clear and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the SELHIE.

This invention relates to combined rock drills and reamer bits, and oneof the-pr ncipal objects of the invention is to provide a rock drillhaving an integral reamer bit at being of greater diameter than theextreine width of the tool.

. View of the same looking Another object of the invention is to providea combined rock drill and reamer bit havingseven cutting corners, and areamer bit extending laterally from the drill-bit and provided withcutting corners and edges, thus eliminating the necessity of using a tseparate reamer bit.

The foregoing and other objects may be trated in theaccompanyingdrawing, in which- Figure l is a, side elevation of acombined rock drill and reaming bit made in accord ance with thisinvention,

at the reamer bit side of the tool, and Fig. 3 is a view looking at theside of the drill opposite the reamer bit.

Referring to the drawing, the numeral 1 designates the tool having astraight edge 2 and a transversely curvedinclined side 3 whichterminates in a reamer bit having oppositely inclined sides 4 and tingedge 5. The drilllbit is provided with the oppositely beveled portion 6forming a cutting corner and theoppositely beveled sides 8 having astraight lower edge 9." The Specification of Letters Patent.-

.Fig. 2 is an edge a plain cut- Fatented its,

oppositeside of the bit from the beveled portion 6 is also beveled at 10on opposite sides to form the cutting corners i1 and and from this pointto the edge #3 of the reamer bit, the drill bit is also bevelec as at 13on opposite sides. At the opposite end of the toolv is anintegral collarlt'and a threaded tapering attaching bar 15 From the foregoing-it willbe obvious that the reaming bit connected integrally with the drillW'illcut a hole slightly larger than the major diameter of the tool, and willthus permit the use of the same easing I the way'down.

A combined rock drill and rearner bit made in accordance With thisinvention can. be used to EtClVZLIIhZtgBlIL all kinds of drilling ,andoperated by any character of power,

and will save time and expense in drilling as well as reaming the hole,and Will eliminate the use of a separate reamer.

Various changes may be made in the de y tails of construction ithoutdeparting from the spirit and scope of the invention de fined in theclaim. What is claimed is:-- 3 In a rock drill having a stool: with astraightedge, atrans'versely cfirved inclined opposite edge, and acutting face formed on one end thereof comprising a horizontal cut tingedge having oppositely beveled sides, inclined oppositely beveled sidecutting (iii edges radiating from said horizontal cutting edge, oneofsaid side cutting edges extending to a point beyond the other sideedge,

a cutting edge having oppositely beveled sides extending upwardly fromsaid long beveled edge, and an extension extending at right angles. fromsaid upwardly extending cut-- ting edge having a cutting edge formedthereon, the meeting edges of said beveled faces forming cuttingcorners.

. In testimony whereof: I affix my signature .in presence of twoWitnesses.

